The ip sr command is used to configure IPv6 Segment Routing (SRv6)
internal parameters.
Those parameters include the mapping between an HMAC key ID and its
associated hashing algorithm and secret, and the IPv6 address to use
as source for encapsulated packets.
The ip sr hmac set command prompts for a passphrase that will be used
as the HMAC secret for the corresponding key ID. A blank passphrase
removes the mapping. The currently supported algorithms for ALGO are
sha1 and sha256.
If the tunnel source is set to the address :: (which is the default),
then an address of the egress interface will be selected. As this
operation may hinder performances, it is recommended to set a non-
default address.

This page is part of the iproute2 (utilities for controlling TCP/IP
networking and traffic) project. Information about the project can
be found at
⟨http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2⟩.
If you have a bug report for this manual page, send it to
netdev@vger.kernel.org, shemminger@osdl.org. This page was obtained
from the project's upstream Git repository
⟨git://git.kernel.org/pub/scm/linux/kernel/git/shemminger/iproute2.git⟩
on 2017-09-15. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-to-
date source for the page, or you have corrections or improvements to
the information in this COLOPHON (which is not part of the original
manual page), send a mail to man-pages@man7.org
iproute2 14 Apr 2017 IP-SR(8)